Nasm automatic compiler

import os
import subprocess
import fnmatch

def prog(sourcesPath):
    global pathed
    if nasm_check():
        if os.path.isdir(sourcesPath):
            print("Folder founded, compiling")
            asm_compiller(sourcesPath)
        else:
            print('"sources" folder not found. Please specify your asm files dir: ')
            userdir = input()
            if os.path.isdir(userdir):
                print('User folder founded, compiling')
                pathed = userdir
                asm_compiller(userdir)
            else:
                print('Folder not found')
    else: print('nasm not found')


def asm_compiller(path):
    global errors
    global repeated
    for top, dirs, files in os.walk(path):
        for nm in files:
            if fnmatch.fnmatch(os.path.basename(os.path.join(top, nm)),'*.asm'):
                write_to_log('Comping ' + os.path.join(top, nm))
                if not nm in repeated:
                    args = ['nasm', '-f', 'bin', os.path.join(top, nm), '-o', nm[:-3]+'com']
                else:
                    args = ['nasm', '-f', 'bin', os.path.join(top, nm), '-o', nm[:-4]+'({}).com'.format(str(repeated.count(nm)))]
                p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
                err = p.communicate()[0].decode("utf-8")
                if err:
                    errors = errors + err + '\n'
                    write_to_log(err)
                else:
                    write_to_log('No errors')
                repeated.append(nm)

def nasm_check():
    files = os.listdir(os.getcwd())
    for i in files:
        if i == 'nasm.exe':
            return True
    return False

def make_log():
    f = open('compile.log','w')
    f.write('')
    f.close()

def write_to_log(txt):
    f = open('compile.log','a')
    f.write(txt+'\n')
    f.close()

pathed = os.getcwd() + '\\sources'
repeated=[]
while True:
    make_log()
    repeated=[]
    errors ='Error list:\n'
    prog(pathed)
    write_to_log('Totally compiled {} files.'.format(len(repeated)))
    errors = errors + 'Check compile.log for more'
    print (errors)
    print('Again? (Enter to repeat, anything to quit)')
    inp=input()
    if inp: break